gameInfo = {
    roomId: null,
    thisUserId: null,
    thatUserId: null,
    isWhite: true,
}

//////////////////////////////////////////////////
// 设定界面显示相关操作
//////////////////////////////////////////////////

function setScreenText(me) {
    let screen = document.querySelector('#screen');
    if (me) {
        screen.innerHTML = "轮到你落子了!";
    } else {
        screen.innerHTML = "轮到对方落子了!";
    }
}

//////////////////////////////////////////////////
// 初始化 websocket
//////////////////////////////////////////////////
// TODO

let websocket = new WebSocket('ws://127.0.0.1:8080/game');

websocket.onopen = function () {
    console.log("游戏房间连接成功!");
}

websocket.close = function () {
    console.log("与服务器断开连接!");
}

websocket.onerror = function () {
    console.log("与服务器连接出现异常!");
}

window.onbeforeunload = function () {
    websocket.close();
}
// 处理服务器响应数据
websocket.onmessage = function (event) {
    console.log(event.data);
    let resp = JSON.parse(event.data);
    if (resp.message !== "gameReady"){
        console.log('响应类型错误!');
        return;
    }
    if (!resp.ok){
        alert('连接游戏失败!');
        console.log("resp: "+ resp.reason);
        location.assign('login.html');
        return;
    }
    gameInfo.roomId = resp.roomId;
    gameInfo.thisUserId = resp.thisUserId;
    gameInfo.thatUserId = resp.thatUserId;
    gameInfo.isWhite = (resp.whiteUser === resp.thisUserId);
    initGame();

    setScreenText(gameInfo.isWhite);
}
//////////////////////////////////////////////////
// 初始化一局游戏
//////////////////////////////////////////////////
function initGame() {
    // 是我下还是对方下. 根据服务器分配的先后手情况决定
    let me = gameInfo.isWhite;
    // 游戏是否结束
    let over = false;
    let chessBoard = [];
    //初始化chessBord数组(表示棋盘的数组)
    for (let i = 0; i < 15; i++) {
        chessBoard[i] = [];
        for (let j = 0; j < 15; j++) {
            chessBoard[i][j] = 0;
        }
    }
    let chess = document.querySelector('#chess');
    let context = chess.getContext('2d');
    context.strokeStyle = "#BFBFBF";
    // 背景图片
    let logo = new Image();
    logo.src = "image/chess.jpg";
    logo.onload = function () {
        context.drawImage(logo, 0, 0, 450, 450);
        initChessBoard();
    }

    // 绘制棋盘网格
    function initChessBoard() {
        for (let i = 0; i < 15; i++) {
            context.moveTo(15 + i * 30, 15);
            context.lineTo(15 + i * 30, 430);
            context.stroke();
            context.moveTo(15, 15 + i * 30);
            context.lineTo(435, 15 + i * 30);
            context.stroke();
        }
    }

    // 绘制一个棋子, me 为 true
    function oneStep(i, j, isWhite) {
        context.beginPath();
        context.arc(15 + i * 30, 15 + j * 30, 13, 0, 2 * Math.PI);
        context.closePath();
        var gradient = context.createRadialGradient(15 + i * 30 + 2, 15 + j * 30 - 2, 13, 15 + i * 30 + 2, 15 + j * 30 - 2, 0);
        if (!isWhite) {
            gradient.addColorStop(0, "#0A0A0A");
            gradient.addColorStop(1, "#636766");
        } else {
            gradient.addColorStop(0, "#D1D1D1");
            gradient.addColorStop(1, "#F9F9F9");
        }
        context.fillStyle = gradient;
        context.fill();
    }

    chess.onclick = function (e) {
        if (over) {
            return;
        }
        if (!me) {
            return;
        }
        let x = e.offsetX;
        let y = e.offsetY;
        // 注意, 横坐标是列, 纵坐标是行
        let col = Math.floor(x / 30);
        let row = Math.floor(y / 30);
        if (chessBoard[row][col] == 0) {
            // 发送坐标给服务器, 服务器要返回结果
            send(row,col);

            // oneStep(col, row, gameInfo.isWhite);
            // chessBoard[row][col] = 1;
        }
    }

    // 实现发送落子请求逻辑, 和处理落子响应逻辑.
    function send(row,col) {
        console.log("send");
        let req = {
            message: 'putChess',
            userId: gameInfo.thisUserId,
            row: row,
            col: col
        };
        websocket.send(JSON.stringify(req));
    }
    websocket.onmessage = function (event) {
        console.log(event.data);
        let resp = JSON.parse(event.data);
        if (resp.message !== 'putChess'){
            console.log(resp.message);
            console.log("响应类型错误!");
            return;
        }
        if (resp.userId === gameInfo.thisUserId){
            oneStep(resp.col,resp.row,gameInfo.isWhite);
        }else if (resp.userId === gameInfo.thatUserId){
            oneStep(resp.col,resp.row,!gameInfo.isWhite);
        }else{
            console.log("resp userId 错误!");
            return;
        }

        chessBoard[resp.row][resp.col] = 1;

        // 交换落子
        me = !me;
        setScreenText(me);

        let screenDiv = document.querySelector('#screen');
        if (resp.winner !== 0){
            if (resp.winner === gameInfo.thisUserId){
                // alert('你赢了!');
                screenDiv.innerHTML = '你赢了!';
            }else if (resp.winner === gameInfo.thatUserId){
                // alert('你输了!');
                screenDiv.innerHTML = '你输了!';
            }else{
                alert('winner字段错误!');
            }
            // location.assign('game_hall.html');
            let backBtn = document.createElement("button");
            backBtn.innerHTML = '返回游戏大厅';
            backBtn.onclick = function () {
                location.assign('game_hall.html');
                alert('已经回到游戏大厅了!');
            }
            let fatherDiv = document.querySelector('.container>div');
            fatherDiv.appendChild(backBtn);
        }
    }
}

